Fig. 3: Theoretical ηSTH achievable from S2 system and relevant parameters.
From: Single junction CsPbBr3 solar cell coupled with electrolyzer for solar water splitting
a ηSTH of S2 overall water splitting technology in comparison, theoretical ηSTH calculated with various b Vloss in relation to Eg and ηEC of electrolyzer cell. Calculation was conducted by using simulation software provided by Seger et al. 38. PV efficiency was simulated with the assumption that EQE of the cell can reach 100%, max Voc will be limited by SQ limit (~490 mV in relation to Eg of light absorber for PV), with a maximum Fill factor of PV to be 80.0%. Exemplary input is shown in Supplementary Fig. 32. Reported single light absorber—2 photons for overall water splitting systems from ref. 6 (Al:SrTiO3–RhCrOx + CoOx, ηSTH 0.65 %), ref. 49 (Cdot/C3N4, ηSTH 2.0 %), ref. 23 (InGaN–Pt + IrOx, ηSTH 3.4%), ref. 50. (Ta3N5/NaTaO3–RhCrOx + IrOx, ηSTH 0.014%), ref. 51 (Y2Ti2SO5S2–RhCrOx + IrOx, STH 0.007%), this work (SnO2/CsPbBr3/PTAA–IrOx/Ti + Pt/Ti, ηSTH 2.4%) (NiFeOx and Pt on Ni foil, ηSTH 3.0%) (NiFeOx and Pt on Ni foam, ηSTH 3.4%). All referred reports demonstrated quantified gas evolution of hydrogen and oxygen.
